hyper schema `media` example

[Mihai B]

Hyper schema documentation[0] specifies two properties(type and binaryEncoding)  for the `media` keyword but the example uses a new keyword (`mediaType`) not mentioned in the docs or the schema. Is it a typo?

Mihai.

[0] http://json-schema.org/latest/json-schema-hypermedia.html#anchor10